Скачать или смотреть How to Display a ProgressHud Before Network Calls in Swift

Learn how to effectively display a progressHud in Swift before your network calls complete, ensuring a better user experience.
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How to Display a ProgressHud Before Network Calls in Swift

When developing applications for iOS, creating a seamless user experience is crucial. A common scenario that developers encounter is the need to show users that a process is underway, especially when involving network requests that may take a few seconds to finish. Ideally, a ProgressHud should appear before a network call starts, indicating to users that something is in progress. Unfortunately, many developers face a problem where the ProgressHud fails to display until after the network call completes. In this guide, we'll explore why this happens and how you can resolve it effectively.

Understanding the Problem

In the code snippet below, the intention is to display a ProgressHud before starting a time-consuming network call. However, due to how the code is structured, the ProgressHud does not display until after the network request completes, leading to a poor user experience.

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The user is left wondering about the status of their request since there is no visual indication of progress during the waiting period.

The Solution: Asynchronous Execution

The root of the issue lies in how the drawImage function executes. It likely performs the network call synchronously, meaning that the UI thread is blocked until the network request is completed. As a result, the ProgressHud cannot be rendered until after the operation finishes.

Steps to Fix the Issue

To ensure that the ProgressHud is displayed immediately, you need to run your network call asynchronously. Here’s how to do it with Swift:

Dispatch to the Main Thread:
To allow UI updates while the network call is processing, wrap your network call in a dispatch to the main thread asynchronously.

Update Your Code:
Modify the draw() function to include the asynchronous dispatch, as shown in the code below:

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Breakdown of the Code Changes

DispatchQueue.global(qos: .userInitiated): This line executes drawImage() on a background thread, allowing the UI to remain responsive.

DispatchQueue.main.async: After the network task is complete, this line dismisses the ProgressHud and updates the drawing status on the main thread, ensuring that UI changes are smooth and seamless.

Conclusion

Implementing this method not only improves the user experience by providing immediate feedback through the ProgressHud, but it also enhances the overall responsiveness of your application. By running network requests asynchronously, you allow users to stay informed and engaged, eliminating confusion during loading times. So the next time you implement a network call in Swift, remember to use asynchronous execution for the best results!

Quick Tips

Always ensure UI updates happen on the main thread.

Use background threads for time-consuming tasks, like network calls.

Consider using libraries like Alamofire for easier handling of network calls.

By following these steps, you'll improve your app's performance and create a better experience for your users!